[PATCH 0/1] drm/panel: st7703: Fix initialization failures on Xingbangda XBD599

[PATCH 0/1] drm/panel: st7703: Fix initialization failures on Xingbangda XBD599

[Frank Oltmanns]

This patch fixes intermittent panel initialization failures and screen
corruption during resume from sleep on panel xingbangda,xbd599 (e.g.
used in PinePhone).

It was originally submitted by Ondrej Jirman in July 2020:
https://lore.kernel.org/all/20200716123753.3552425-1-megous@megous.com/

The original patchset contained two patches. One of them broke the panel
on the Purism Librem 5.

This is the concluding message from Guido Günther in that thread:
https://lore.kernel.org/all/20200801110409.GA6351@bogon.m.sigxcpu.org/#t

Guido wanted changes to the commit message. I updated it to adress his
requests.

I send this patch in Ondřej's name with his consent.

The patch is based on drm-next.

Please let me know what you think.

Thanks,
  Frank

Ondrej Jirman (1):
  drm/panel: st7703: Pick different reset sequence

 drivers/gpu/drm/panel/panel-sitronix-st7703.c | 25 ++++++++++---------
 1 file changed, 13 insertions(+), 12 deletions(-)

-- 
2.39.1

[PATCH 1/1] drm/panel: st7703: Pick different reset sequence

[Frank Oltmanns]

From: Ondrej Jirman <megi@xff.cz>

Switching to a different reset sequence, enabling IOVCC before enabling
VCC.

There also needs to be a delay after enabling the supplies and before
deasserting the reset. The datasheet specifies 1ms after the supplies
reach the required voltage. Use 10-20ms to also give the power supplies
some time to reach the required voltage, too.

This fixes intermittent panel initialization failures and screen
corruption during resume from sleep on panel xingbangda,xbd599 (e.g.
used in PinePhone).

Signed-off-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
Reported-by: Samuel Holland <samuel@sholland.org>
---
 drivers/gpu/drm/panel/panel-sitronix-st7703.c | 25 ++++++++++---------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
index 6747ca237ced..45695aa51f62 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
@@ -411,29 +411,30 @@ static int st7703_prepare(struct drm_panel *panel)
 		return 0;
 
 	dev_dbg(ctx->dev, "Resetting the panel\n");
-	ret = regulator_enable(ctx->vcc);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+	ret = regulator_enable(ctx->iovcc);
 	if (ret < 0) {
-		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
+		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
 		return ret;
 	}
-	ret = regulator_enable(ctx->iovcc);
+
+	ret = regulator_enable(ctx->vcc);
 	if (ret < 0) {
-		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
-		goto disable_vcc;
+		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
+		regulator_disable(ctx->iovcc);
+		return ret;
 	}
 
-	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
-	usleep_range(20, 40);
+	/* Give power supplies time to stabilize before deasserting reset. */
+	usleep_range(10000, 20000);
+
 	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
-	msleep(20);
+	usleep_range(15000, 20000);
 
 	ctx->prepared = true;
 
 	return 0;
-
-disable_vcc:
-	regulator_disable(ctx->vcc);
-	return ret;
 }
 
 static const u32 mantix_bus_formats[] = {
-- 
2.39.1

Re: [PATCH 0/1] drm/panel: st7703: Fix initialization failures on Xingbangda XBD599

[Guido Günther]

Hi Frank,

Thanks for giving this another spin!

On Sat, Feb 11, 2023 at 06:17:47PM +0100, Frank Oltmanns wrote:
> This patch fixes intermittent panel initialization failures and screen
> corruption during resume from sleep on panel xingbangda,xbd599 (e.g.
> used in PinePhone).
> 
> It was originally submitted by Ondrej Jirman in July 2020:
> https://lore.kernel.org/all/20200716123753.3552425-1-megous@megous.com/
> 
> The original patchset contained two patches. One of them broke the panel
> on the Purism Librem 5.

Just for completeness: It's the Librem 5 Devkit, the Librem 5 uses the
mantix,mlaf057we51-x panel.

> This is the concluding message from Guido Günther in that thread:
> https://lore.kernel.org/all/20200801110409.GA6351@bogon.m.sigxcpu.org/#t
> 
> Guido wanted changes to the commit message. I updated it to adress his
> requests.
> 
> I send this patch in Ondřej's name with his consent.
> 
> The patch is based on drm-next.
> 
> Please let me know what you think.

I'll retest this on the devkit on the next days, might be a moment until
I get to that.

Cheers,
 -- Guido

Re: [PATCH 0/1] drm/panel: st7703: Fix initialization failures on Xingbangda XBD599

[Frank Oltmanns]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: multipart/mixed; boundary="=-=-=", Size: 0 bytes --]

Re: [PATCH 1/1] drm/panel: st7703: Pick different reset sequence

[Guido Günther]

Hi,
On Sat, Feb 11, 2023 at 06:17:48PM +0100, Frank Oltmanns wrote:
> From: Ondrej Jirman <megi@xff.cz>
> 
> Switching to a different reset sequence, enabling IOVCC before enabling
> VCC.
> 
> There also needs to be a delay after enabling the supplies and before
> deasserting the reset. The datasheet specifies 1ms after the supplies
> reach the required voltage. Use 10-20ms to also give the power supplies
> some time to reach the required voltage, too.
> 
> This fixes intermittent panel initialization failures and screen
> corruption during resume from sleep on panel xingbangda,xbd599 (e.g.
> used in PinePhone).
> 
> Signed-off-by: Ondrej Jirman <megi@xff.cz>
> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
> Reported-by: Samuel Holland <samuel@sholland.org>
> ---
>  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 25 ++++++++++---------
>  1 file changed, 13 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index 6747ca237ced..45695aa51f62 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -411,29 +411,30 @@ static int st7703_prepare(struct drm_panel *panel)
>  		return 0;
>  
>  	dev_dbg(ctx->dev, "Resetting the panel\n");
> -	ret = regulator_enable(ctx->vcc);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +
> +	ret = regulator_enable(ctx->iovcc);
>  	if (ret < 0) {
> -		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
> +		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
>  		return ret;
>  	}
> -	ret = regulator_enable(ctx->iovcc);
> +
> +	ret = regulator_enable(ctx->vcc);
>  	if (ret < 0) {
> -		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
> -		goto disable_vcc;
> +		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
> +		regulator_disable(ctx->iovcc);
> +		return ret;
>  	}
>  
> -	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> -	usleep_range(20, 40);
> +	/* Give power supplies time to stabilize before deasserting reset. */
> +	usleep_range(10000, 20000);
> +
>  	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> -	msleep(20);
> +	usleep_range(15000, 20000);
>  
>  	ctx->prepared = true;
>  
>  	return 0;
> -
> -disable_vcc:
> -	regulator_disable(ctx->vcc);
> -	return ret;
>  }
>  
>  static const u32 mantix_bus_formats[] = {

Reviewed-by: Guido Günther <agx@sigxcpu.org>

Cheers,
 -- Guido

> -- 
> 2.39.1
> 

Re: [PATCH 1/1] drm/panel: st7703: Pick different reset sequence

[Guido Günther]

Hi,
On Sat, Feb 11, 2023 at 06:17:48PM +0100, Frank Oltmanns wrote:
> From: Ondrej Jirman <megi@xff.cz>
> 
> Switching to a different reset sequence, enabling IOVCC before enabling
> VCC.
> 
> There also needs to be a delay after enabling the supplies and before
> deasserting the reset. The datasheet specifies 1ms after the supplies
> reach the required voltage. Use 10-20ms to also give the power supplies
> some time to reach the required voltage, too.
> 
> This fixes intermittent panel initialization failures and screen
> corruption during resume from sleep on panel xingbangda,xbd599 (e.g.
> used in PinePhone).

Thanks, applied to drm-misc-next.
Cheers,
 -- Guido

> 
> Signed-off-by: Ondrej Jirman <megi@xff.cz>
> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
> Reported-by: Samuel Holland <samuel@sholland.org>
> ---
>  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 25 ++++++++++---------
>  1 file changed, 13 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> index 6747ca237ced..45695aa51f62 100644
> --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> @@ -411,29 +411,30 @@ static int st7703_prepare(struct drm_panel *panel)
>  		return 0;
>  
>  	dev_dbg(ctx->dev, "Resetting the panel\n");
> -	ret = regulator_enable(ctx->vcc);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +
> +	ret = regulator_enable(ctx->iovcc);
>  	if (ret < 0) {
> -		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
> +		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
>  		return ret;
>  	}
> -	ret = regulator_enable(ctx->iovcc);
> +
> +	ret = regulator_enable(ctx->vcc);
>  	if (ret < 0) {
> -		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
> -		goto disable_vcc;
> +		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
> +		regulator_disable(ctx->iovcc);
> +		return ret;
>  	}
>  
> -	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> -	usleep_range(20, 40);
> +	/* Give power supplies time to stabilize before deasserting reset. */
> +	usleep_range(10000, 20000);
> +
>  	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> -	msleep(20);
> +	usleep_range(15000, 20000);
>  
>  	ctx->prepared = true;
>  
>  	return 0;
> -
> -disable_vcc:
> -	regulator_disable(ctx->vcc);
> -	return ret;
>  }
>  
>  static const u32 mantix_bus_formats[] = {
> -- 
> 2.39.1
> 

Re: [PATCH 1/1] drm/panel: st7703: Pick different reset sequence

[Chris Morgan]

On Sun, Oct 15, 2023 at 02:49:20PM +0200, Guido Günther wrote:
> Hi,
> On Sat, Feb 11, 2023 at 06:17:48PM +0100, Frank Oltmanns wrote:
> > From: Ondrej Jirman <megi@xff.cz>
> > 
> > Switching to a different reset sequence, enabling IOVCC before enabling
> > VCC.
> > 
> > There also needs to be a delay after enabling the supplies and before
> > deasserting the reset. The datasheet specifies 1ms after the supplies
> > reach the required voltage. Use 10-20ms to also give the power supplies
> > some time to reach the required voltage, too.
> > 
> > This fixes intermittent panel initialization failures and screen
> > corruption during resume from sleep on panel xingbangda,xbd599 (e.g.
> > used in PinePhone).
> 
> Thanks, applied to drm-misc-next.
> Cheers,
>  -- Guido

Thank you. Probably too late, but this fixes problems I have with a
different ST7703 based panel.

Tested-by: Chris Morgan <macromorgan@hotmail.com>

> 
> > 
> > Signed-off-by: Ondrej Jirman <megi@xff.cz>
> > Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
> > Reported-by: Samuel Holland <samuel@sholland.org>
> > ---
> >  drivers/gpu/drm/panel/panel-sitronix-st7703.c | 25 ++++++++++---------
> >  1 file changed, 13 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> > index 6747ca237ced..45695aa51f62 100644
> > --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> > +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c
> > @@ -411,29 +411,30 @@ static int st7703_prepare(struct drm_panel *panel)
> >  		return 0;
> >  
> >  	dev_dbg(ctx->dev, "Resetting the panel\n");
> > -	ret = regulator_enable(ctx->vcc);
> > +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > +
> > +	ret = regulator_enable(ctx->iovcc);
> >  	if (ret < 0) {
> > -		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
> > +		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
> >  		return ret;
> >  	}
> > -	ret = regulator_enable(ctx->iovcc);
> > +
> > +	ret = regulator_enable(ctx->vcc);
> >  	if (ret < 0) {
> > -		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
> > -		goto disable_vcc;
> > +		dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
> > +		regulator_disable(ctx->iovcc);
> > +		return ret;
> >  	}
> >  
> > -	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> > -	usleep_range(20, 40);
> > +	/* Give power supplies time to stabilize before deasserting reset. */
> > +	usleep_range(10000, 20000);
> > +
> >  	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> > -	msleep(20);
> > +	usleep_range(15000, 20000);
> >  
> >  	ctx->prepared = true;
> >  
> >  	return 0;
> > -
> > -disable_vcc:
> > -	regulator_disable(ctx->vcc);
> > -	return ret;
> >  }
> >  
> >  static const u32 mantix_bus_formats[] = {
> > -- 
> > 2.39.1
> >